The senescence of the immune system.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D000818:Animals; D000917:Antibody Formation; D000936:Antigen-Antibody Complex; D001323:Autoantibodies / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D004198:Disease Susceptibility; D006801:Humans; D007109:Immunity; D007121:Immunocompetence; D007239:Infections / Q000276:immunology; D008264:Macrophages / Q000502:physiology; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000502:physiology; D013951:Thymus Hormones / Q000502:physiology
D000936:Antigen-Antibody Complex; D001323:Autoantibodies; D013951:Thymus Hormones